diff options
Diffstat (limited to 'man3/erf.3')
| -rw-r--r-- | man3/erf.3 | 27 |
1 files changed, 13 insertions, 14 deletions
@@ -13,7 +13,7 @@ .\" Modified 2002-07-27 by Walter Harms .\" (walter.harms@informatik.uni-oldenburg.de) .\" -.TH erf 3 2023-07-20 "Linux man-pages 6.05.01" +.TH erf 3 2023-10-31 "Linux man-pages 6.7" .SH NAME erf, erff, erfl \- error function .SH LIBRARY @@ -22,24 +22,24 @@ Math library .SH SYNOPSIS .nf .B #include <math.h> -.PP +.P .BI "double erf(double " x ); .BI "float erff(float " x ); .BI "long double erfl(long double " x ); -.PP +.P .fi .RS -4 Feature Test Macro Requirements for glibc (see .BR feature_test_macros (7)): .RE -.PP +.P .BR erf (): .nf _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE .fi -.PP +.P .BR erff (), .BR erfl (): .nf @@ -51,7 +51,7 @@ Feature Test Macro Requirements for glibc (see These functions return the error function of .IR x , defined as -.PP +.P .in +4n .EX erf(x) = 2/sqrt(pi) * integral from 0 to x of exp(\-t*t) dt @@ -61,20 +61,20 @@ erf(x) = 2/sqrt(pi) * integral from 0 to x of exp(\-t*t) dt On success, these functions return the value of the error function of .IR x , a value in the range [\-1,\ 1]. -.PP +.P If .I x is a NaN, a NaN is returned. -.PP +.P If .I x is +0 (\-0), +0 (\-0) is returned. -.PP +.P If .I x is positive infinity (negative infinity), +1 (\-1) is returned. -.PP +.P If .I x is subnormal, @@ -85,7 +85,7 @@ See .BR math_error (7) for information on how to determine whether an error has occurred when calling these functions. -.PP +.P The following errors can occur: .TP Range error: result underflow (\fIx\fP is subnormal) @@ -95,7 +95,7 @@ Range error: result underflow (\fIx\fP is subnormal) An underflow floating-point exception .RB ( FE_UNDERFLOW ) is raised. -.PP +.P These functions do not set .IR errno . .\" It is intentional that these functions do not set errno for this case @@ -116,12 +116,11 @@ T{ .BR erfl () T} Thread safety MT-Safe .TE -.sp 1 .SH STANDARDS C11, POSIX.1-2008. .SH HISTORY C99, POSIX.1-2001. -.PP +.P The variant returning .I double also conforms to |